Please merge commit 85c2ceaafbd3 ("mm/damon/sysfs: eliminate potential uninitialized variable warning") to >=5.19 stable kernels.
In 2023-10-31, I sent[1] a fix for v5.19. After a week, Dan found an issue in the fix and sent a fix. At that time, the commit that Dan was fixing was merged in the mm tree but not in the mainline. Hence, Dan didn't Cc stable@.
However, now the broken fix[1] is merged in the mainline as commit 973233600676 ("mm/damon/sysfs: update monitoring target regions for online input commit"), and all >=5.19 stable trees. Hence Dan's fix should also applied to those trees. Please apply those.
Note that the bug was only potential[3] due to unchecked return value. However, the unchecked return value was not an intentional behavior but a bug. Hence we further made the return value to be checked[4]. The return value check fix is also merged in the relevant stable trees, so the fix is now needed for a real bug.
[1] https://lore.kernel.org/all/20231031170131.46972-1-sj@kernel.org/ [2] https://lore.kernel.org/all/739e6aaf-a634-4e33-98a8-16546379ec9f@moroto.moun... [3] https://lore.kernel.org/all/20231106165205.48264-1-sj@kernel.org/ [4] https://lore.kernel.org/all/20231106233408.51159-1-sj@kernel.org/
Thanks, SJ